Skip to main content

Full text of "Text Book Of Mechanical Engineering"

See other formats


734

Pump Efficiencies.

valve c, none passing D, while the volume in B, or halfa goes to
delivery pipe: thus there is constant delivery, though suction only
occurs on alternate strokes. An additional non-return valve E
permits each pump to be worked separately. (See also pp. 1204
to 1210.)

mats
	fO=
	'ST
	O/v
	
	
	
	
	
	
	
	
	
	
	fio ^ 70 £
 :«
 •AID i

				
	" — .
	
	
	p
	Lit*
	PS
	
	
	
	

	
	
	
	
	fll'
	^^
	^>*
	t
	
	
	"**.
	^ •
	
	

	
	
	flip
	JlJ
	(---J
	
	
	
	JSs
	
	
	'**
	>^
	

	r,f
	Kj!
	-"'
	
	
	
	
	
	
	"^
	\
	
	^
	

	
	
	
	
	
	
	
	
	
	
	\
	
	
	30$
 aofc
 10 »«


	
	
	
	
	
	
	
	
	
	
	
	\
	
	

	
	
	
	
	
	
	
	
	
	
	
	\
	
	

	
	
	
	LI*
	~r
	*w
	F
	tsi
	
	
	
	
	
	
Pump Efficiencies. — At Fig. 723 is a diagrammatic
statement of the efficiencies of centrifugal and piston pumps
under different heads, shewing that the former are least efficient